How often does your doctor check your vitamin levels? Sadie just had hers done about six months ago and they started her on a vitamin D supplement and lowered her vitamax. Today she had another visit and they wanted to check her vitamin levels again, but I held them off til next time because I had to go to work. Is it normal to check them twice or more a year? Or do you think it can wait til summer? Why do they constantly want to stick her?